Knot tying device



Feb. 1, 1949. D. BURKARD KNOT TYING DEVICE Filed March 7, 1945 Patented Feb. 1, 1 949 noble-re ca, Zurich;

Switzerland AnnlicatiomMai-ch 7, 1945, Senial Nbzfiiflg iefiwfii InSwi-merland May 1:2,. 141445 li The'present invention relates. to'knottying devices, and more particularly to; devicesfor cut.- ting and knotting packing means such. as packthread; twine, strings,v bands orthe like. which comprise a knottingplug. pnovid'edwith. cutting means" and with a brake for, thecpackthread or the like. 7

Knottyingdevices have already been proposed which: are formed by-a twoilpart finger in which one: of the two movable; partscarries. tl efbrake and a cutting: knifeE These known devices pre sentv the: disadvantage that the movable parts do not permit an independent adjustment oithe brakeand of the cutting knife;

According to thepresent invention the knotting plug is carried by a.- base and is f ormedi at least in two parts, one'of, whichlisrigidwithlthe base while the otherpart is; movablyr mounted and bears against thefixed part.-v

The knotting plug has its: exterior. contour.

preferablyformed incone-shape.- Thi sishape is advantageous for the reason that, slidingoisthe thread along theconesurf-ace isfa-vourably in.- fluenced; In a preferred embodiinentof'the. device according tothe invention the-; angle on the apex of the cone is approximately 303. The bones-haned" plug; preferablyconsistsaof three, parts and is divided in. such manner'that one, ofl the' threeupa-rts comprises onethalft of the.plug','j.while the twoother partscomprise-each /4; ofl'the' plug and the plug: is i cut alongplanesapassing. through the axis of the plug. I

One: of the three parts, conveniently that part which is; for-med from the half. plug; is} rigidly. connected with the base; in at preferred: embodi+ ment; oli the invention; while;the-; twc, other parts are, movable relatively to the fixed. part andt9 the'base: By meansoi a spring the-two movableefie ctivecwhenethevbrakezalreadynhaszgripped and is holding thetwinex;

Ah: advantageous construct-1cm of the: knottin plug liesdn the f act, that itylS'ziOHilGdfihOllOW: The: cutting: edge Ofrthehnife andi the brake surface arethenj soidisposed -'alon'g;,.the wallssof the coneshaped; plug-, thatv they; are. notparallel, but; en-g close an angle one with another owmg;to,-the--:in--

clination: of. the. surfaces of the-plug. Sucha dis: position has the advantage that-the twine-tension increases duringthecutting t. The thread is pressed from. above intothe plug between the" fixed. portions and the two movableportiensiior effecting the k-notting, It. isthusfirst gri ppedcbx' thebrake and shortly" afterwards by the cutting; knife; But since the cuttingknitefand-ithe'bralie are always. further spaced: uponfurther down? ward: movement, thetwine; isy tensionedbetween the knife and. the brake;. so that arcleansevering; isinsured. I 1 I Since the device principally serves for. making carryingloops on papen bags onpack-ages it is convenient to construct it" in such manner; that its operation-is not hindered: by the holding. of: the packages oi: the bags; For-this purpose-a package a carrier can be; associated with; the: twine. knotter which carrier; allows putting the package down during the utilisation of the: twine knotter.

Finally it is also advantageous: forthe'openation of the twine knotter; When there is provided a: device for unwindingthe twine from-thevtwine. ball. Thisdevice is advantageously providedwitlr a brake which; prevents the unwinding:v thread from automatically unwinding;

The accompanying.- drawing representsz' byway; of example apreferred: embodiment; ofthesinvene tion; without intention: tovlimit the invention: to the illustrated: details;

Fig; 1 shows. a knot-tying; device accordingte the invention-in side elevation.

Fig. 2, shows the: devicedn the plan view;

Fig. 3. shows the: actual: k-not; tien'form-edas' a p ;Fig:;, his; a section through thephlg, along. the line IV" I -V of-Fig; k

Fig. 5 is a section through the'plug along' the line-. V.V of.Fig;. 2= n Fig; 6: shows :the' formed-knots:

In the: drawings; numeral-1 I designates a base;- onwhich is formed the: cone-shaped knotting plug Therplugt'consiste off a portionrrigidlyw connected with the base 7 and two: portions-9'3; 3!" whichare movablerelativelwto theibasejr I; The. angleatthevertex.of:theconershapediplugimeasr ures.;about: 30-. V e a Thelplugzportions3; 3 are iormed-hollow as ca r bezelearlye seen in Fig a 5-.- Byvmeans of. eyesvtl' 4f and=of a-traversingpinai; whichis-iconvenientlx provided with a screw threadlfi atzone. end; whileit; carries a; head I on tha other end,.- the two por tionyfiare-lateralhe heldftogethem Thepin'li'pse VideS": at the same time ac bearing; on. whichithetwo-r ping; portions 3, 315* can turn= about the 1 pin:

5 as an axis. The bottom surfaces 45, 46 of the portions 3 are slightly tapered. Two balls 8 abut against the respective surfaces 45, 46 and are pressed upwardly by springs 9. The springs 9 are placed in bores ID of the base i which are closed at the bottom by screws l I.

It is apparent from the drawing that the balls 8 yieldingly press the two movable plug portions,

4 28 the collar 21 and the part 30 move back to the position of rest. 7

An unwinding device for the twine is carried by the fixed collar 25 by the intermediary of an arm 34.

The unwinding device consists of two semispherical cups, one of which 35 is disposed on the arm $4. The other half 35 is placed over the first one. A twine ball 37 is placed within the cup and the end of the twine is pulled out through an opening 38 placed on top of the cup.

In order that the twine does not run back,

' a brake is disposed in the interior of the unwindformed as a brake. The surface 15, as well as the by the brake I5, [6 and then it makes contact with the cutting knife i2. When the thread is pulled downwardly between the surfaces i5 and 16, the movable part 3 forming the brake is slightly turned backwards, whereby the pressure exerted on the thread by the action of the spring 9 increases. In this manner a safe cutting of the twine by the knife is insured, while at the same time the brake holds the thread. Since the cut ting'knife is inclined relatively to the brake, and the cutting knife and the brake are closer to each other towards the vertex of the plug'than towards the base of the plug, the twine is tensioned between the brake and the cutting knife while being pulled downwardly.

A pin is is screwed in the base i of the plug and is secured therein by a set screw 2|]. pin carries a plate 2i rigidly connected thereto and traversed by screws 22. These screws 22 serve for securing the device to a table, a wall board or the like. The board 23'is thus inserted into the space between the base i and the plate 2|.

The plate 25 is secured to the pin l9 by the set screw 24. The lower end of the pin l9 carries a collar 25 secured by means of a screw 26. A second freely movable collar 21 is disposed above this collar 25 on the pin 19. This movable collar 21 is connected to the plate 2! by a spiral spring 28 surrounding the pin l9, which spring allows the collar 21 to effect a pivoting movement, but returns it to the original position when the pull exerted on the'collar ceases. I

From Figs. 1 and 2 it is apparent that the collar 25 rigidly connected to the pin I9 carries a pan-shaped part 29 of wire gratings, which constitutes one half of a holding basket for the pack ages. The movable collar 2'! carries the second half 36 of the holding basket. The holding basket is advantageously made from strong wire and comprises finger-shaped extensions 3|, 32 extending one between the others in the position of'rest. When a pullingeffort is exerted on the movable portion 36, the'basket opens'the movable collar 21 turning about the pin [9. The package 33 is thenplaceol into the basket and knotting of the carrying loop is effected by means of the'plug. When the knotting is effected the package is raised fromthe holding basket by the formed loop. Owing to the tension of the spiral spring ing device, conveniently below the opening 38, the execution of the brake being recognisable for example from Figs. 1 and 2. It consists of a wire spring 39 which is bent like shears about two screw pins iii. The twine I8 is pulled between the shears and thereby braked.

For protecting the middle parts of the device (spring 28 and pin Hi) there can be provided aprotecting sleeve M. g

The described device principally serves when packing articles of any kind. When a package or a bag is to be strapped by twine, first a piece of twine of appropriate length is cut oiT from the provision ball it being possible to use the knife i2 of the plug 2, 3. This piece of twine is then used for strapping the package, and when it is desired to provide the twine with a carrying loop, the package is brought into the basket 25,. 3G and the two endsit of the twine (Fig. l.) are disposed about the plug in the manner represented, and the end portion is introduced from above into the entrance ll between the fixed part 2 and the movable parts 3 of t e plug. The two twine ends are thereby gripped and held by the brake i5, iii. When thereafter the two twine ends projecting from the plug are 40 pulled downwardly in the direction of the arrow,

This

the two twines are out through by the edge of the knife {2, while the ends are gripped b the brake and maintained. The package is now raised fromthe basket 2Q, 39, whereby the loop placed around the plug is pulled off the plug, while it slides over the twine ends held in the brake. In this manner the knot is automatically formed, as is represented in Fig. 6. By means of a further pulling action exerted on the package, the

knot tightens and finally the gripped twine ends are pulled out of the brake and the carrier loop is thus formed.

The device can also be used only for thepreparation of the twine and for cutting it off. In this manner of use the twine pulled off from the ball is cut to the desired length by pressing it into the entrance i! of the plug, while the remainder of the twine is held fast by the brake and thus is made'ready for the next use.

It is, of course, to be understood that the above described structure is merely illustrative and in no wise limiting andthat I desire to comprehend within 'my invention all modifications included within the scope of the appended claims.

I claim: V

' l. A device for tying knots in twine or the like, comprising a knotting plug, a base therefor, said plug including a fixed part rigid with the base and at least a'movably mounted part, means for yieldingly applying said movable part against the fixed part, a cutting means for the twine disposed between said fixed and movable parts of the plugfand braking meansfor the twine formed between said each other.

parts of the plug applied against 2. A knot tying device for tying knots in twine or the like, comprising a knotting plug, a base therefor, said plug including a fixed part rigid with said base and two movably mounted parts, means for yieldingly applying said movable parts against the fixed part, a cutting knife for the twine carried by one of said movable parts, and a brake for the twine formed between the other movable part and the fixed part of the plug.

3. A knot tying device for tying knots in twine or the like, comprising a cone-shaped knotting plug, a base therefor, said plug including a fixed part rigid with said base and two hollow parts hingedly mounted on the base, means for yieldingly applying the movable parts against the fixed part, a cutting knife for the twine carried by one of said movable parts and penetrating into a slot provided in the fixed part, and a brake for the packthread formed by cooperating surfaces of the other of said movable parts and of the fixed part, said knife having a cutting edge which is inclined relatively to the cooperating brake surfaces.

4. A knot tying device as claimed in claim 3, in which the angle at the vertex of the cone-shaped knotting plug measures approximately 30.

5. A knot tying device as claimed in claim 3, in which the cooperating braking surfaces of the fixed and movable plug parts are roughened.

6. A knot tying device as claimed in claim 2, and comprising springs to yieldingly apply the movable parts of the knotting plug against the fixed part, and means for varying the pressure of the springs.

7. A knot tying device for tying knots in twine or the like, comprising a knotting plug, a base therefor, said plug including a fixed part rigid with said base and two movable parts hingedly mounted on the base, a cutting knife for the twine carried by one of said movable parts, a gripping brake for the twine formed between the other movable part and the fixed part, said base of the knotting plug being provided with a bore beneath each of the hingedly mounted parts of the plug, a spring disposed in each of said bores for yieldingly urging the movable parts against the fixed part of the plug, and means for varying the pressure exerted by said spring on the movable parts of the plug.

DAVID BURKARD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 207,123 Keller Aug. 20, 1378 242,859 Augspurger June 14, 1881 274,828 Savage Mar, 27, 1883 743,347 Terwilleger Nov. 3, 1903 1,354,668 Lea Oct. 5, 1920 2,276,919 Brassel et a1 Mar. 17, 1942 FOREIGN PATENTS Number Country Date 17,451 Great Britain Aug. 11, 1904 

